#include<stdio.h>
int array[100]={1,5,2,8,3,9,2,8,7,7,8,4,7,3,8,4,1,5,4,4,5,9,6,2,7,3,6,2,
1,1,2,8,1,7,2,8,5,9,8,8,9,3,0,6,1,7,0,6,5,5,6,2,5,1,6,2,9,3,2,2,3,7,4,0,5,1,
4,0,9,9,0,6,9,5,0,6,3,7,6,6,7,1,8,4,9,5,8,4,3,3,4,0,3,9,4,0,7,1,0,0};
int main()
{
    char a[102];
    char *ptr;
    int p, q;
    scanf("%s", a);
    while(a[0]!='0')
    {
        p=0;
        ptr=a;
        while(*ptr!='\0')
        {
            q=p;
            p=*ptr-'0';
            ptr++;
        }
        printf("%d\n", array[p+10*q-1]);
        scanf("%s", a);
    }
    return 0;
}
